In 1991, Marvel launched this series, the second comic book with the title "X-Men". The original series was known as X-Men (1963 series) and then Uncanny X-Men (1981 series). This series is known as X-Men (1991 series) until issue #113. The name of the series then changed to "New X-Men". There are five covers for issue #1, each one is identified by the name of the character featured on the particular cover (plus a 'deluxe' cover of heavier card stock).